HardLabs

Beat707

FrankBuss·beat707·kicad/beat707/beat707.kicad_pcb

Beat707 PCB layout, top view — open source AVR/Arduino board by FrankBuss
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About the Beat707 PCB

Beat707 is an open source AVR/Arduino PCB design by FrankBuss, published on GitHub. It is a 2-layer board measuring 276.9 × 142.2 mm, with 263 components from 34 distinct parts.

Its main chip is the ATmega328-PU, from the AVR/Arduino family. Other key parts include the 6N138, 74HC14, TM1638, CA56-12EWA and SN74AHC125. By type, the board carries 95 diodes, 83 resistors, 33 switches, 20 capacitors, 16 ICs and 15 connectors.

It belongs with the audio designs in this gallery.

From the project

A MIDI sequencer

For programming you can use an USBasp. The red wire of the USBasp programmer needs to be connected to the pin 1 location:

For debugging, there is the jumper J5 near the MIDI connector, to connect a 5V UART receiver. Connect the top pin to GND (black wire in the image) and the bottom pin to the UART RX input (grey wire) :

The Arduino IDE doesn't flash the ATmega fuses, so initially you need to do this from the command line with avrdude like this:

Beat707, from the project README
From the project README

Main components on the Beat707

6N13874HC14ATmega328-PUTM1638CA56-12EWASN74AHC125MB85RS2MTLP2950CZ-3.3GSN74AHCT125

Beat707 bill of materials (BOM)

263 components, 34 distinct parts.

QtyPartRefs
1
6N138
U1
1
74HC14
U2
1
ATmega328-PU
U3
3
TM1638
U4, U7, U10
6
CA56-12EWA
U5, U6, U8, U9, U11, U12
1
SN74AHC125
U13
1
MB85RS2MT
U14
1
LP2950CZ-3.3G
U15
1
SN74AHCT125
U16
1
20 MHz
Y1
1
footswitch
J1
1
click-out
J2
1
MIDI-in
J3
1
MIDI-out
J4
1
serial debug
J5
1
+5V
J6
1
GND
J7
1
USB_B
J8
6
free IO
J9, J10, J12, J13, J14, J15
1
ISP
J11
Show 14 more
QtyPartRefs
1
Rotary_Encoder_Switch
SW1
32
SW_Push
SW18, SW19, SW20, SW21, SW22, SW23, SW24, SW25 +24
59
1N4148
D1, D2, D3, D4, D5, D6, D7, D8 +51
36
LED
D32, D33, D34, D35, D56, D57, D58, D59 +28
8
1nF
C1, C3, C8, C9, C10, C11, C19, C20
9
100nF
C2, C4, C6, C7, C14, C15, C16, C17 +1
1
47uF
C5
2
22pF
C12, C13
20
220
R1, R2, R3, R4, R6, R8, R10, R11 +12
4
1k
R5, R27, R28, R29
19
10k
R7, R9, R12, R13, R14, R15, R16, R17 +11
24
10
R51, R52, R53, R54, R55, R56, R57, R58 +16
8
0
R102, R103, R104, R105, R106, R107, R108, R109
8
33
R137, R138, R140, R141, R142, R143, R144, R145

Beat707 design files

The KiCad project lives in the FrankBuss/beat707 repository on GitHub; these links point at the commit this page was built from.

Beat707: common questions

What microcontroller does the Beat707 use?

The Beat707 is built around the ATmega328-PU, from the AVR/Arduino family.

How big is the Beat707 PCB?

The Beat707 measures 276.9 × 142.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Beat707?

263 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the Beat707 design files?

From the FrankBuss/beat707 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Beat707 design in my own project?

The repository has no license, so all rights stay with FrankBuss. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Beat707 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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